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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . T A S K I N G . R E S T R I C T E D . S T A G E S --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2023, Free Software Foundation, Inc. --
10 -- --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
17 -- --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
29 -- --
30 ------------------------------------------------------------------------------
32 -- This is a simplified version of the System.Tasking.Stages package,
33 -- intended to be used in a restricted run time.
35 -- This package represents the high level tasking interface used by the
36 -- compiler to expand Ada 95 tasking constructs into simpler run time calls
37 -- (aka GNARLI, GNU Ada Run-time Library Interface)
39 -- Note: the compiler generates direct calls to this interface, via Rtsfind.
40 -- Any changes to this interface may require corresponding compiler changes
41 -- in exp_ch9.adb and possibly exp_ch7.adb
43 -- The restricted GNARLI is also composed of System.Protected_Objects and
44 -- System.Protected_Objects.Single_Entry
46 with System.Parameters;
47 with System.Secondary_Stack;
48 with System.Task_Info;
50 package System.Tasking.Restricted.Stages is
51 pragma Elaborate_Body;
53 ---------------------------------
54 -- Compiler Interface (GNARLI) --
55 ---------------------------------
57 -- The compiler will expand in the GNAT tree the following construct:
59 -- task type T (Discr : Integer);
61 -- task body T is
62 -- ...declarations, possibly some controlled...
63 -- begin
64 -- ...B...;
65 -- end T;
67 -- T1 : T (1);
69 -- as follows:
71 -- task type t (discr : integer);
72 -- tE : aliased boolean := false;
73 -- tZ : size_type := unspecified_size;
75 -- type tV (discr : integer) is limited record
76 -- _task_id : task_id;
77 -- _atcb : aliased system__tasking__ada_task_control_block (0);
78 -- end record;
80 -- procedure tB (_task : access tV);
81 -- freeze tV [
82 -- procedure tVIP (_init : in out tV; _master : master_id;
83 -- _chain : in out activation_chain; _task_name : in string;
84 -- discr : integer) is
85 -- begin
86 -- _init.discr := discr;
87 -- _init._task_id := null;
88 -- system__tasking__ada_task_control_blockIP (_init._atcb, 0);
89 -- _init._task_id := _init._atcb'unchecked_access;
90 -- create_restricted_task (unspecified_priority, tZ,
91 -- unspecified_task_info, unspecified_cpu,
92 -- task_procedure_access!(tB'address), _init'address,
93 -- tE'unchecked_access, _task_name, _init._task_id);
94 -- return;
95 -- end tVIP;
97 -- _chain : aliased activation_chain;
98 -- activation_chainIP (_chain);
100 -- procedure tB (_task : access tV) is
101 -- discr : integer renames _task.discr;
103 -- procedure _clean is
104 -- begin
105 -- complete_restricted_task;
106 -- finalize_list (F14b);
107 -- return;
108 -- end _clean;
110 -- begin
111 -- ...declarations...
112 -- complete_restricted_activation;
113 -- ...B...;
114 -- return;
115 -- at end
116 -- _clean;
117 -- end tB;
119 -- tE := true;
120 -- t1 : t (1);
121 -- t1S : constant String := "t1";
122 -- tIP (t1, 3, _chain, t1S, 1);
124 Partition_Elaboration_Policy : Character := 'C';
125 pragma Export (C, Partition_Elaboration_Policy,
126 "__gnat_partition_elaboration_policy");
127 -- Partition elaboration policy. Value can be either 'C' for concurrent,
128 -- which is the default or 'S' for sequential. This value can be modified
129 -- by the binder generated code, before calling elaboration code.
131 procedure Create_Restricted_Task
132 (Priority : Integer;
133 Stack_Address : System.Address;
134 Stack_Size : System.Parameters.Size_Type;
135 Sec_Stack_Address : System.Secondary_Stack.SS_Stack_Ptr;
136 Sec_Stack_Size : System.Parameters.Size_Type;
137 Task_Info : System.Task_Info.Task_Info_Type;
138 CPU : Integer;
139 State : Task_Procedure_Access;
140 Discriminants : System.Address;
141 Elaborated : Access_Boolean;
142 Chain : in out Activation_Chain;
143 Task_Image : String;
144 Created_Task : Task_Id);
145 -- Compiler interface only. Do not call from within the RTS.
146 -- This must be called to create a new task, when the partition
147 -- elaboration policy is not specified (or is concurrent).
149 -- Priority is the task's priority (assumed to be in the
150 -- System.Any_Priority'Range).
152 -- Stack_Address is the start address of the stack associated to the task,
153 -- in case it has been preallocated by the compiler; it is equal to
154 -- Null_Address when the stack needs to be allocated by the underlying
155 -- operating system.
157 -- Stack_Size is the stack size of the task to create.
159 -- Sec_Stack_Address is the pointer to the secondary stack created by the
160 -- compiler. If null, the secondary stack is either allocated by the binder
161 -- or the run-time.
163 -- Secondary_Stack_Size is the secondary stack size of the task to create.
165 -- Task_Info is the task info associated with the created task, or
166 -- Unspecified_Task_Info if none.
168 -- CPU is the task affinity. We pass it as an Integer to avoid an explicit
169 -- dependency from System.Multiprocessors when not needed. Static range
170 -- checks are performed when analyzing the pragma, and dynamic ones are
171 -- performed before setting the affinity at run time.
173 -- State is the compiler generated task's procedure body.
175 -- Discriminants is a pointer to a limited record whose discriminants are
176 -- those of the task to create. This parameter should be passed as the
177 -- single argument to State.
179 -- Elaborated is a pointer to a Boolean that must be set to true on exit
180 -- if the task could be successfully elaborated.
182 -- Chain is a linked list of task that needs to be created. On exit,
183 -- Created_Task.Activation_Link will be Chain.T_ID, and Chain.T_ID will be
184 -- Created_Task (the created task will be linked at the front of Chain).
186 -- Task_Image is a string created by the compiler that the run time can
187 -- store to ease the debugging and the Ada.Task_Identification facility.
189 -- Created_Task is the resulting task.
191 -- This procedure can raise Storage_Error if the task creation fails.
193 procedure Create_Restricted_Task_Sequential
194 (Priority : Integer;
195 Stack_Address : System.Address;
196 Stack_Size : System.Parameters.Size_Type;
197 Sec_Stack_Address : System.Secondary_Stack.SS_Stack_Ptr;
198 Sec_Stack_Size : System.Parameters.Size_Type;
199 Task_Info : System.Task_Info.Task_Info_Type;
200 CPU : Integer;
201 State : Task_Procedure_Access;
202 Discriminants : System.Address;
203 Elaborated : Access_Boolean;
204 Task_Image : String;
205 Created_Task : Task_Id);
206 -- Compiler interface only. Do not call from within the RTS.
207 -- This must be called to create a new task, when the sequential partition
208 -- elaboration policy is used.
210 -- The parameters are the same as Create_Restricted_Task except there is
211 -- no Chain parameter (for the activation chain), as there is only one
212 -- global activation chain, which is declared in the body of this package.
214 procedure Activate_Restricted_Tasks
215 (Chain_Access : Activation_Chain_Access);
216 -- Compiler interface only. Do not call from within the RTS.
217 -- This must be called by the creator of a chain of one or more new tasks,
218 -- to activate them. The chain is a linked list that up to this point is
219 -- only known to the task that created them, though the individual tasks
220 -- are already in the All_Tasks_List.
222 -- The compiler builds the chain in LIFO order (as a stack). Another
223 -- version of this procedure had code to reverse the chain, so as to
224 -- activate the tasks in the order of declaration. This might be nice, but
225 -- it is not needed if priority-based scheduling is supported, since all
226 -- the activated tasks synchronize on the activators lock before they start
227 -- activating and so they should start activating in priority order.
229 -- When the partition elaboration policy is sequential, this procedure
230 -- does nothing, tasks will be activated at end of elaboration.
232 procedure Activate_All_Tasks_Sequential;
233 pragma Export (C, Activate_All_Tasks_Sequential,
234 "__gnat_activate_all_tasks");
235 -- Binder interface only. Do not call from within the RTS. This must be
236 -- called an the end of the elaboration to activate all tasks, in order
237 -- to implement the sequential elaboration policy.
239 procedure Complete_Restricted_Activation;
240 -- Compiler interface only. Do not call from within the RTS. This should be
241 -- called from the task body at the end of the elaboration code for its
242 -- declarative part. Decrement the count of tasks to be activated by the
243 -- activator and wake it up so it can check to see if all tasks have been
244 -- activated. Except for the environment task, which should never call this
245 -- procedure, T.Activator should only be null iff T has completed
246 -- activation.
248 procedure Complete_Restricted_Task;
249 -- Compiler interface only. Do not call from within the RTS. This should be
250 -- called from an implicit at-end handler associated with the task body,
251 -- when it completes. From this point, the current task will become not
252 -- callable. If the current task have not completed activation, this should
253 -- be done now in order to wake up the activator (the environment task).
255 function Restricted_Terminated (T : Task_Id) return Boolean;
256 -- Compiler interface only. Do not call from within the RTS. This is called
257 -- by the compiler to implement the 'Terminated attribute.
259 -- source code:
260 -- T1'Terminated
262 -- code expansion:
263 -- restricted_terminated (t1._task_id)
265 procedure Finalize_Global_Tasks;
266 -- This is needed to support the compiler interface. It will only be called
267 -- by the Environment task in the binder generated file (by adafinal).
268 -- Instead, it will cause the Environment to block forever, since none of
269 -- the dependent tasks are expected to terminate
271 end System.Tasking.Restricted.Stages;